Paper making machine



June 2, 1931.

v w. H. MILLSPAUGH PAPER MAKING MACHINE Filed July 20. 1926.

Patented June 2, 1931 UNITED STATES PATENT OFFICE.

WILLIAM H. MILLSPAUGH, OF SANDUSKY, OHIO, ASSIGNOR TO THE PAPER & TEXTILE MACHINERY (70., OF SANDUSKY, OHIO, A CORPORATION OF OHIO PAPER MAKING MACHINE Application filed July 20, 1926. Serial No. 123,757;

This invention aims to provide an improved paper-.making machine of the vacuum forming cylinder type.

In the accompanying drawings Fig. 1 is a side view partly in section of a machine embodying the invention;

Fig. 2 is a plan view of the sheet-formlng portion of said machine;

- In the cylinder, .with an open side adjacent the interior sur- Fig. 3 is a detail sectional view through the forming cylinder and stock-applying means;

Fig. 4 is an enlarged view of a fragment'of the forming cylinder to show the form of perforations in the cylindrical shell.

Referring to the drawings, the wet sheet is made over a rotating cylinder 1 on an endless wire cloth 3, similar to the making wire of a F ourdrinier machine; this endless wire cloth, hereinafter called the wire, being entrained around and driven by the cylinder. Said cylinder 1 consists of a closely perforated metal shell having equipment for applying vacuum on a portionof its surface traversed by the wire. In order to obtain the greatest possible action of the vacuum on the wire, the perforations in the shell are preferably countersunk to a square shape at their outer ends, as shown in Fig-4. Prepared liquid stock for paper formation bears on a segment of the cylindric forming sur face provided by the wire 3 on the cylinder 1; said liquid stock being continuously supplied to and maintained at a desired level in a vat 2 of appropriate construction to hold the liquid on the cylinder. In the form of vat'shown in Fig. 3, the liquid stock is supplied by pipe 2 to a compartment of the vat and thence underfeeds to another compartment immediately adjacent the cylinder. a stationary suction box 4,

, face of the cylinder, provides a vacuum chamber 5 confronting the liquid body and extend ing to a point above the liquid level. A pipe 6 connects the suction box with apparatus which will maintain in said chamber a suitable vacuum for inducing the wet sheet formation while at the same time drawing ofl the water removed in the process of forming the wet sheet of paper. This pipe connection is located at the lowest practicable point, thus effecting gravity discharge of water and re- I lieving the pump to that extent. The cylinder 7 rotates in a direction to carry the wire 3 upwardly past the contacting body of liquid stock. As the cylinder and wire move past the chamber 5, a closely compacted wet paper sheet is formed on the wire by vacuuminduced formation in accordance with the process described and claimed in my Patent No. 1,739,038, dated December 10, 1929, and also disclosed in my Patent No. 1,718,574, dated June 25, 1929. I

For laterally confining the liquid stock on the cylindrical forming surface, the side wall members 7 of the vat compartment adjacent the cylinder may be constructed as in my previous patents with metal face plate 7*, preferably of copper, or rubber or other suitable material, having concave edges conforming-to the curvature of and closely overlying the cylindric forming surface but not in actual contact therewith. The sheet will erally adjustable to permit makingsheets of different widths, are shown having base extensions 7? resting on the bottom of the vat compartment, and having vertical fi'an'ges 7 adjustably secured to the vat structure by bolt and slot connections at 7 The suction box 4 in the cylinder may be provided with'adjustable ends or heads to control the width of the vacuum area to correspond with the liquid area bearing on the cylinder.

For agitating the liquid stock adjacent the I cylinder in such manner as to promote a crisscross disposition of the fibres, there is proi. e. immediately adjacent to the crev adjacent walls of 3. In a paper-making machine having a suction roll with a stationary suction box providing a lateral vacuum area on the ascending side of said roll, and having a wire traveling thereon, means for feeding pulp solution on the vacuum area comprising a vat having a compartment cooperating with the roll to hold said solution on said lateral vacuum area and having an underfeed pas sage for the flow of pulp under and upwardly to said compartment.

4. In a paper-making machine having a suction roll and wire traveling thereon, means for feeding pulp solution on the vacuum area comprising a vat having a compartment cooperating with the roll and having an underfeed passage for the flow of pulp to said compartment, and means for agitating the solution in said compartment.

5. In a paper-making machine having a suction roll and wire traveling thereon, means for feeding pulp solution on the vacuum area comprising a vat having a compartment cooperating with the roll and having an underfeed passage for the flow of pulp to said compartment, and agitating means in said compartment comprising a series of closely spaced blades adjacent to the forming surface and means for rapidly reciprocating them back and forth across said surface.

6. A paper-making apparatus having a rotating cylinder and wire traveling thereon, with means for holding liquid stock on a segment of the surface provided by the wire on the cylinder, said cylinder consisting of aclosely perforated metal shell containing a stationary suction box for applying vacuum on a portion of the cylindric surface of the Wire, the perforations of the cylindric shell being countersunk at their outer ends to a polygonal shape,'leaving narrow wire supporting walls between the perforations, so as to obtain the greatest possible action of the forming vacuum on the wire.

7. A paper-making machine having a vacuum forming cylinder and wire running therearound on which a wet sheet is formed by vacuum-induced formation over the vacuum area of the cylinder, and a press felt traveling in the same direction as and in engagement with the sheet on the off-bearing run of the wire adjacent to said cylinder, with suction means to effect removal of the wet sheet from the-wire to said press felt.

jacent pressing means through which the felt carries the sheet.

9. -A paper-making machine having a vacuum forming cylinder and wire running therearound on which a wet sheet is formed by vacuum-induced formation over the vacuum area of said cylinder, a press felt traveling in the same direction as and in engagement with the sheet on the off-bearing run of the wire adjacent to the cylinder, and a press comprising coacting rolls around one of which the felt passes, the said roll being a suction transfer roll holding the felt and wire in coaction and causing transfer of the sheet by suction from the wire to the felt.

10. In a paper-making machine, a forming cylinder and an endless strainer medium running therearound providing the surface on which the sheet forms and carrying off the formed sheet from said cylinder, a suction' transfer roll located adjacent-the forming cylinder, and a porous carrying medium traveling around said transfer roll in-the direction of travel of the sheet, the off-bearing run of said strainer medium being in contact with the carrying medium at said transfer roll, and saidtransfer roll having suction means by which the sheet is transferred from said strainer medium to said carrying medium.

In testimonywhereof I aflix my signature.

WILLIAM H. MILLSPAUGH. 

